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Open AccessArticle

Some Considerations about the Use of Contact and Confocal Microscopy Methods in Surface Texture Measurement

Department of Mechanical, Chemical and Industrial Design Engineering, ETS Ingeniería y Diseño Industrial, Universidad Politécnica de Madrid, Ronda de Valencia, 3, 28012 Madrid, Spain
Department of Aerospace Materials and Production, ETSI Aeronáutica y del Espacio, Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros, 3, 28040 Madrid, Spain
Department of Engineering Surveying and Cartography, ETSI en Topografía, Geodesia y Cartografía, Universidad Politécnica de Madrid, Campus Sur, Carretera de Valencia, Km 7, 28031 Madrid, Spain
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1484;
Received: 1 July 2018 / Revised: 17 August 2018 / Accepted: 18 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Special Issue of the Manufacturing Engineering Society (MES))
Surface metrology employs various measurement techniques, among which there has been an increase of noteworthy research into non-contact optical and contact stylus methods. However, some deeper considerations about their differentiation and compatibility are still lacking and necessary. This work compares the measurement characteristics of the confocal microscope with the portable stylus profilometer instrumentation, from a metrological point of view (measurement precision and accuracy, and complexity of algorithms for data processing) and an operational view (measuring ranges, measurement speed, environmental and operational requirements, and cost). Mathematical models and algorithms for roughness parameters calculation and their associated uncertainties evaluation are developed and validated. The experimental results demonstrate that the stylus profilometer presents the most reliable measurement with the highest measurement speed and the least complex algorithms, while the image confocal method takes advantage of higher vertical and horizontal resolution when compared with the employed stylus profilometer. View Full-Text
Keywords: surface texture; contact measurement; optical measurement surface texture; contact measurement; optical measurement
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Caja García, J.; Sanz Lobera, A.; Maresca, P.; Fernández Pareja, T.; Wang, C. Some Considerations about the Use of Contact and Confocal Microscopy Methods in Surface Texture Measurement. Materials 2018, 11, 1484.

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